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HowTo: Light Control Basics
( Mike Robinson)
Step 12 : Dimming
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| | The last thing I'll cover is dimming. Up to this point I've only mentioned turning channels on and off. Common household dimmer switches dim lights by modifying the AC waveform. A brief explanation would be that AC power is transmitted as a continuos wave pattern and by removing pieces of each wave, you lower the current and dim the lights. You can then ramp/fade the lights by varying the amount of waveform removed over time. In order to dim, the hardware has to be compatible. Some examples would be the 595 based "Horning Dimmer" and PIC (Programmable Interupt Controller) based "Renard."
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